fix: Don't use copyStyleSheets with documentPIP (videojs#8314)

* Don't use copyStyleSheets

* Move to dom.js

* Add tests

* Address feedback

src/js/player.js

@@ -3095,9 +3095,9 @@ class Player extends Component {
       return window.documentPictureInPicture.requestWindow({
         // The aspect ratio won't be correct, Chrome bug https://crbug.com/1407629
         width: this.videoWidth(),
-        height: this.videoHeight(),
-        copyStyleSheets: true
+        height: this.videoHeight()
       }).then(pipWindow => {
+        Dom.copyStyleSheetsToWindow(pipWindow);
         this.el_.parentNode.insertBefore(pipContainer, this.el_);
 
         pipWindow.document.body.append(this.el_);

src/js/utils/dom.js

@@ -857,3 +857,30 @@ export function computedStyle(el, prop) {
 
   return '';
 }
+
+/**
+ * Copy document style sheets to another window.
+ *
+ * @param    {Window} win
+ *           The window element you want to copy the document style sheets to.
+ *
+ */
+export function copyStyleSheetsToWindow(win) {
+  [...document.styleSheets].forEach((styleSheet) => {
+    try {
+      const cssRules = [...styleSheet.cssRules].map((rule) => rule.cssText).join('');
+      const style = document.createElement('style');
+
+      style.textContent = cssRules;
+      win.document.head.appendChild(style);
+    } catch (e) {
+      const link = document.createElement('link');
+
+      link.rel = 'stylesheet';
+      link.type = styleSheet.type;
+      link.media = styleSheet.media;
+      link.href = styleSheet.href;
+      win.document.head.appendChild(link);
+    }
+  });
+}

test/unit/player.test.js

@@ -2919,6 +2919,7 @@ QUnit.test('docPiP moves player and triggers events', function(assert) {
   const fakePiPWindow = document.createElement('div');
 
   fakePiPWindow.document = {
+    head: document.createElement('div'),
     body: document.createElement('div')
   };
   fakePiPWindow.querySelector = function(sel) {

test/unit/utils/dom.test.js

@@ -686,3 +686,52 @@ QUnit.test('isSingleLeftClick() checks return values for mousedown event', funct
 
   assert.ok(Dom.isSingleLeftClick(mouseEvent), 'a touch event on simulated mobiles is a single left click');
 });
+
+QUnit.test('Dom.copyStyleSheetsToWindow() copies all style sheets to a window', function(assert) {
+  const fakeWindow = document.createElement('div');
+  const done = assert.async();
+
+  assert.expect(7);
+
+  fakeWindow.document = {
+    head: document.createElement('div')
+  };
+
+  const style1 = document.createElement('style');
+
+  style1.textContent = 'body { background: white; }';
+  document.head.appendChild(style1);
+
+  const style2 = document.createElement('style');
+
+  style2.textContent = 'body { margin: 0px; }';
+  document.head.appendChild(style2);
+
+  const link = document.createElement('link');
+
+  link.rel = 'stylesheet';
+  link.type = 'text/css';
+  link.media = 'print';
+  link.href = 'http://asdf.com/styles.css';
+
+  const containsRulesFromStyle = (el) => {
+    return Boolean([...fakeWindow.document.head.querySelectorAll('style')].find(s => {
+      return s.textContent.includes(el.textContent);
+    }));
+  };
+
+  link.onload = link.onerror = () => {
+    Dom.copyStyleSheetsToWindow(fakeWindow);
+    assert.strictEqual(fakeWindow.document.head.querySelectorAll('style, link').length, document.styleSheets.length, 'the fake window has as many <style> or <link> elements as document.styleSheets');
+    assert.true(containsRulesFromStyle(style1), 'a <style> in the fake window contains content from first <style> element');
+    assert.true(containsRulesFromStyle(style2), 'a <style> in the fake window contains content from second <style> element');
+    assert.strictEqual(fakeWindow.document.head.querySelectorAll('link[rel=stylesheet]').length, 1, 'the fake window has one <link> stylesheet element');
+    const fakeWindowLink = fakeWindow.document.head.querySelectorAll('link[rel=stylesheet]')[0];
+
+    assert.strictEqual(fakeWindowLink.type, link.type, 'the <style> type attribute in the fake window is the one from <link> element');
+    assert.strictEqual(fakeWindowLink.href, link.href, 'the <style> href attribute in the fake window is the one from <link> element');
+    assert.strictEqual(fakeWindowLink.media, link.media, 'the <style> media attribute in the fake window is the one from <link> element');
+    done();
+  };
+  document.head.appendChild(link);
+});